3551213 has 2 divisors, whose sum is σ = 3551214. Its totient is φ = 3551212.

The previous prime is 3551209. The next prime is 3551221. The reversal of 3551213 is 3121553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2301289 + 1249924 = 1517^2 + 1118^2 .

It is a cyclic number.

It is not a de Polignac number, because 3551213 - 2² = 3551209 is a prime.

It is a super-2 number, since 2×3551213² = 25222227542738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3551243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775606 + 1775607.

It is an arithmetic number, because the mean of its divisors is an integer number (1775607).

Almost surely, 2^3551213 is an apocalyptic number.

It is an amenable number.

3551213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3551213 is an equidigital number, since it uses as much as digits as its factorization.

3551213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 450, while the sum is 20.

The square root of 3551213 is about 1884.4662374264. The cubic root of 3551213 is about 152.5664030447.

Adding to 3551213 its reverse (3121553), we get a palindrome (6672766).

The spelling of 3551213 in words is "three million, five hundred fifty-one thousand, two hundred thirteen".